ls1_camaro_z28

I read the offset thread before i wrote this. Im going to buy the tt2 vintage wheels and it appears that the deepest dish is -18 offset on their site? Im looking at the 17x11. Please help me out, I want the wheels to come to the edge of the qauter panel. i know everyone here knows what i mean. Also what offset will make the same affect for the front? For the rear im getting 315's and the front will have 275's. Sorry for all of this ,but also the rear is stock, not tubbed or anything. Thanks for all the info. Oh and the car is a 98 camaro Z28.